Saw blade



1 'Marcl go; 1928. 1,663.24]

E. CHESHIR SAW BLADE Fi1ed bec. 9. 1926 Patented Man. 20, 1928.

' UNITED sur-as PATENT OFFICE.

EDWARD dansmnn, or sur. rnTrnsnnaa, nomma] saw BLADE.

Application flled Deeember 9, 1926. gerial Noi153,483.

ting edge or upsetting said teeth. By reason of'this clearance the chips ont by said teeth have a passageway for escape from the ent tmg-edge. As heretofore provided, however,

saws have been limited in their usefulness to the cu tting of either relativel hard material or relatively soft material, epending upon their design. 'Up to the time ofthe present invention no saw, in so*far as applicant is informed, had the advantage chat uniform and continuons clearance had been provided for cutting metal such as copper, brass, and the all0ys used in the printing trade, which saw was also useful in cutting wood.

In the cutting of nelatively soft material such as wood, it has been common praotice to use what are known in the art as soft saws. These saws are tempered so that they can be set or swedged and fterward filed to bring them to a keen edge, being too soft t0 ont metal such as copperand zinc and the various allo'ys such as are used in the printing art, except with many repeated sharpenings. Due to the fact that sharpening isoften done in a manner lackin precision, it frequently happens that so%t saws have only one or two saw teeth which are eflective in the cutting operation. In the printing trade hollow ground saws have been used for cuttingfbrass rule. Such savvs have loft much to beidesired, however, when used for sawing the softer metals, for the reason that the hollow grinding distiibutes the dearance over a considerahle diameter of the saw instead of utiliging the possible side clearance to a maximum. v A

' An object of the present invention 15 to provide a saw blade that is universally eflective for sawing matterials of widely varving degrees of hardness.

A further object 15 to provide a saw hlade of universal application which is more effective than pr1or Saws in allowing the ch1ps 4 to get away from the cutting edge.

4 which saw blade inay be tempered to the de A further object is to provide a saw blade for cutting both soft and hard material,

indicated by the'numeral 5.

grec necessary for cutting relatively hard material, whereby the necessity for resharp ening is minimized. v

With these and various 'other objects in view, the invention consists of certain novel eatures of construction and operation as wiil be more fullydescribd and particularly po1nted out in the specificafiion, drawings and claims zippended hereto.

In the drawings, Wherein like reference characters are used to designate like parts- Figure 1 is a side view of a saw mbodymg the principles of the present invention;

Figure 2 is a sectional view "on an enlarged scale of one of the teeth of the saw blade illustrated in Figure 1, said sectional view being taken along the Plane indicated by the arrows'22 of Figure l; and

Figure 3 is a sectional view of another tooth of the saw blade illustrated in Figure 1,. Figure 3 being taken alon the plane indicated bythe arrows 33 of igure 1.

The present invention has been illustrated in connection with a circular saw. Said circular saw comprises the disk portion 1,

which disk portion has a substantialIy uniform thickness out to the circle indicated by the numeral 2, which circle is disposed only a short distance Within the foot of the savi teeth.. The disk portion 1 may be provided with the usual apertures, whereby the saw blade may be mounted npon.its support. The saw teeth, as will be noted from an ins ection of:the drawin are of twoshapes, a ternate teeth being ientical with one another and the intrmdiate teeth being identical with One anothe'r. The numerals 33 indicate teeth.of one design, and the alternate teeth, indicated by the numerals 4, are of a diflerent design.

It will be noted from an inspection of Figures 1 and 2 that the saw teeth 3 +3 are upset to have a graduall .flaring cross sc tional outline from the oncle 2 to the outer extremity of said teeth. The intermediate teeth 4- 4, as Will be noted from an inspection of, Figure 3, are provided with clearance at their outer cutting edges, which clearance is due to the fact that the peripheral surface of each of said teeth 44 is beveled off, as

The saw blade according to the resent invention is tempred to suit the ardest materal which is to be cit and must, accordingly, be gronnd to brmg the cutting. edges of the teeth to the necessary km.

beveled off edge portions of the interme-' diate teeth 4-4:, the saw is efiicient not -only in the cutting of relativly hard matenal, for which it has been tempered, but 1s also deCidedly effective in the cutting of relatively soft material, which in the absence of the efl'ective clearance space provided wonld quickly fou1 the saw.

The present invention isintended rimarily for use in the printing trade, as or exampe in. ,connection With coinposing room saws. Inasmuch as such saws are called upon frequently to saw wood, brass, copper and alloys of varying degrees of hardness, together With other materials difizering widely in hardness, and inasmuch astrequently materials of difierent -hardness are to be out in a single cntting operation, the universal features of the saw are particularl advantageous in that art.

hat is claimed is 1. A saw blade for cutting both hard and soft materials comprising a supporting portion and teeth projecting therefrom, said supporting'portion having a substantially uniform thickness, said" teeth being flared continuously from said supportixig portion outwardly, intermediate tecth being-beveled teeth, the depth'and cuttmg c1rcle of all of the teetlt being substantiall the same but.

at their outer edges to provide clearance.

2. A saw blade for cutting both hard and soft materials comprising a supporting portion and teeth projecting therefrom, said supporting portion having a substantially uniform thickness, said teth being flared continuously from said supporting portion outwardly, intermediate teeth being beveled at their outer edges to provide clearance,

' said saw blade being tempered to suit the hardest material Which it is intended to out.

4. A circular saw blade having a flatsupporting portion of" substantially uniform thickness and a toothed-edge portion which edge portion flares outwardly fron 1 said suppOrting portion symmetrically wlth respect to said suppofting portion, intermediate 'teeth of said edge portion being beeled at theirouter edges to provide clearance, said saw blade being tempered to suit the hardest material which it is intended to out.

5. In a device of the character described, the combination of a supporting portion having teethprojecting therefrom, said teeth fiaring outwardly, intermdiate teeth being beveled, said teeth'being of the s'ame effective height.

' 6. In a device of the character described, the combination of a supporting' portion A having teeth projecting therefrom, said teeth flaring outwardly from.a knuckle defining teeth portions, intermediate teeth of said device being bevel ed.

7 In a device of the Charactr desribed,

the combination of a supporting portion 1 having teethprojecting therefrom, said -ing peripheral toothed annulus to provide' lateral cleara'ncc back from the ends of the alternate teeth having ,respectively straight outer peripheral edges and the intermediate teeth being beveled off at the side corners;

1 9; A circular saw blade including a sup-- -a defining knuckle, intermediate teeth of said saw being beveled, the. depth of said te eth froin said knuckle being equal.

.10. A circ'ularsaw blade includinga supporting portion .having teeth projecting therefrom, said teeth fiaring outWardly from a defining knuckle, intermediate teeth of said saw being beveled,'the depth of said teeth frofn said knuckle being equal, said saw blade being tempered t0 suitthe hardest material which it is intended to cut.

Signed at Cleveland, Ohio, this 6th day of December, 1926.

v EDWARD CHESHIBE.

teeth flaring outwardly froni a knuekle de- 

